/*
 * Copyright 2009 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.spockframework.util;

/**
 *
 * @author Peter Niederwieser
 */
public class None<T> implements Option<T> {
  private static final None instance = new None();

  private None() {}

  public boolean hasValue() {
    return false;
  }

  public T getValue() {
    throw new UnsupportedOperationException("getValue");
  }

  @SuppressWarnings("unchecked")
  public static <T> None<T> value() {
    return instance;
  }
}
